CA Compliant model uses MRB Conversion This firearm comes from the factory with our patented MRB (magazine release block conversion) This conversion allows this firearm to be compliant in the state of California.  The BATTLEARMS® WORKHORSE® series of firearms are built for duty and hard use in mind.  It is purpose-built around the forged WORKHORSE® 7075-T6 aircraft-grade aluminum receiver and free-float rail handguard with M-LOK attachment point at 3, 6, and 9 o’clock positions.  At 12 o’clock is a full-length Picatinny accessory rail with our signature notch cut matching the upper receiver.  Every firearm is equipped with a 4150 chrome-moly steel black nitride barrel for durability and accuracy.  Each barrel is individually head-spaced with a matching 9130 steel bolt and 8620 black nitride carrier for ultimate reliability and ease of cleaning. Look a bit more closely and you will find this duty line of rifles are not so “plain jane”.  It is loaded with numerous enhanced components such as a smooth nickel Teflon trigger, enhanced magazine release, enhanced takedown/pivot pins for easy tool-less breakdown, one-piece magazine catch, billet trigger guard, enhanced bolt catch, user-adjustable three-position pistol grip, and enhanced single side safety. The WORKHORSE® series offers an amazing value.  The perfect firearm for duty or home defense. Receiver Model: WORKHORSE® (Forged)Type: Semi-Auto RifleCaliber: .223/5.56X45Muzzle Thread: 1/2x28 TPIRail: 15in WORKHORSE® M-LOK Free-Float RailGas System: Mid LengthBarrel Length: 16inBarrel Twist Rate: 1:7TBarrel Profile/Finish/Material: Medium Profile, Black Nitride, 4150 CM,  .750" Diameter Gas Block JournalWeight: 6.3 lbs (2.86 kg)Overall Length: 36.25in (920.75mm)Collapsed Length: 33in (838.2mm)Charging Handle: Mil-Spec Single Sided Charging HandleTrigger: Enhanced Nickel Teflon TriggerSafety: Enhanced Single Sided SafetyStock: B5 Bravo - Adjustable 6-Position StockFinish: Type 3 Black AnodizedMagazine: (1) 10rd MagazineSights: Optics Ready Platform